Cosmological LTB black hole in a quintom universe Sareh Eslamzadeh, Kourosh Nozari and J. T. Firouzjaee Eur. Phys. J. C, 83 11 (2023) 1057 Published online: 19 November 2023 DOI: 10.1140/epjc/s10052-023-12215-1